#include <bits/stdc++.h>
using namespace std;

template<class T> void Out(T x) {
    if(x < 0) putchar('-'), x = x;
    if(x >= 10) Out(x / 10);
    putchar(x % 10 + '0');
}

int main() {
    __int128 t = 13LL;
    t = t * t;
    Out(t); putchar('\n');
    return 0;
}